Question

What is the atomic weight of oxygen?

• A. 8
• B. 12
• C. 16
• D. 18

Hint:

Atomic weight of oxygen = 16, hydrogen = 1 → so water \(H_2O\) has molar mass = 18 g/mol.

Answer 1

The Correct Option is C

Step 1: Recall oxygen details.
Oxygen has atomic number 8 and its most common isotope is \(O^{16}\).
Step 2: Atomic weight.
The relative atomic mass (atomic weight) of oxygen is 16 u.
Step 3: Conclusion.
Thus, the correct answer is 16.